Edit 1:
Other domains are working, just checked and i they work spotless...
Edit 2:
/usr/local/vesta/bin/v-add-letsencrypt-domain exclusivest real-domain.tld www.real-domain.tld no
Error: LetsEncrypt account registration 400
Same error...
Domain works, but without https... other domains on same server work perfectly, i used certbot to generate on same server one ssl for the same domain and it worked, (i deleted that ssl).

If this cannot be done via web interface, how do i generate the ssl manualy and put it in vestacp (to set it and forget it, to automaticaly renew)